Workers walk during a shift change outside an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

Coils of steel are seen at an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

Coils of steel are seen at an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

Coils of steel are seen at an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

Coils of steel are seen at an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

Coils of steel are seen at an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

Coils of steel are seen at an ArcelorMittal Dofasco facility in Hamilton, Ontario, Canada, on August 24, 2026. The administration of US President Donald Trump warned on August 23 that Canada would be "foolish" to think it could win a trade war with the United States, predicting a "devastating" impact on its northern neighbor. Negotiations between Washington and Ottawa broke down late August 22, putting into force new 50-percent US tariffs impacting about $20 billion worth of Canadian goods, or 5.5 percent of Canadian exports to the US. Canada in retaliation said it would match US tariffs, with new levies notably targeting the US steel and dairy industries to take effect on September 8. (Photo by Cole Burston / AFP via Getty Images)

WASHINGTON, DC - AUGUST 24: Construction continues on a new helipad on the South Lawn of the White House and the East Wing ballroom on August 24, 2026, in Washington, DC. The Supreme Court has temporarily cleared the way for construction of U.S. President Donald Trump's White House ballroom to continue while the justices consider whether the administration had the authority to undertake the massive project without congressional approval. (Photo by Andrew Harnik/Getty Images) *** BESTPIX ***